Car AC is a system that modern driving is unthinkable without. But most drivers don't understand how it works or what they need to do to maintain it. Here's the complete guide.
How Does Car AC Work?
The system works on the same principle as a refrigerator. The compressor compresses gaseous refrigerant, which heats up. The hot refrigerant passes through the condenser (in front of the radiator), where it cools and liquefies. The liquid refrigerant passes through an expansion valve, where pressure drops sharply and the refrigerant evaporates in the evaporator behind the dashboard. During evaporation, it absorbs heat from the cabin air — and that's how you stay cool. The entire cycle repeats continuously.
Most Common Problems
From our experience at HOT22, here's the ranking: low refrigerant (55% of visits), dirty cabin filter (20%), unpleasant smell from the evaporator (15%), compressor issues (5%), electrical problems (3%), system leak (2%). Most problems are resolved quickly and without major expense — as long as you don't wait until they get worse.
Maintenance Schedule
Having a similar issue? Contact us for quick diagnostics.
Every 12 months: cabin filter replacement. Every 2 years: check and if needed recharge the refrigerant. Every 2-3 years: cabin ozone treatment. Every 5 years: inspect hoses and seals. At the first sign: diagnostics for noise, weak cooling, or odor. This schedule is approximate — if you drive a lot or in harsh conditions (city traffic, hot climate), intervals may be shorter.
Services at HOT22 Varna
AC system diagnostics — using a professional scanner and gauges, we check pressure, temperatures, and electrical parameters. Refrigerant recharge R134a and R1234yf — with an automatic station, gram by gram. Leak detection — UV dye test and electronic detector. Compressor repair — from clutch replacement to full rebuild. Heater repair — flushing and replacing the heater core. Ozone treatment and disinfection — for clean and healthy air. Cabin filter replacement — quick and affordable.
When Should You Visit a Shop?
Don't wait for summer. The best time to check your AC is spring — March and April. Shops aren't busy, you can pick a convenient time, and prices for some services may be better. At HOT22, you can book online or call 089 338 3443. We're located in Varna and service cars of all makes.
